Warp stop motion for looms



p 1930. w. H. WAKEFIELD 1,756,611

WARP STOP MOTION FOR LOOMS Filed Nov. 2, 1928 Mfi MIKE/WELD IzQ Avvzwwsya Patented Apr. 29, 1930 UNITED STATES Fries V WALTER H. WAKEFIELD, WORCESTER, MASSACHUSETTS, ASSIGNOR TO CROMPTON .& KNOWLES LOOM WORKS, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS V WAR? s'ror MOTION ronLooMs Application filed November 2, 1928.; Serial No. 316,834.

This invention relates to improvements in Warp stop motions for looms and it is the general object of the invention to provide a weight controlled knock-01f and actuating element which is preferably located near the front of the loom so as to have direct engagement with the shipper handle. 7

' The invention relates more particularly to the type of motion set forth in reissue patent to Regan No. 14,829 combined with certai'nfeatures shown in the Holmes Patent No. 1,360,688. In these patents there is employed a non-circular detector rod which must be rocked about its axis periodically. It is necessary to effect this oscillation with the ap-' plication of a comparatively small force in order not to subject the drop wires to undue strain and it is accordingly an important object of my invention to provide a yielding actuator for the detector rods which shall act not only to rock thelatter but to move an actuator relatively to the knock-off device preferably the shipper handle.

It is a more particular object of my present invention to locate the knock-oif and actuating mechanism adjacent the front of the loom while the detecting mechanism is located at the rear of the loom and operative to connect these two mechanisms by a control rod acted on by a single cam and lever to rock the detector rods and also operate the knockoff mechanism.

a With these andother objects in view which will appear as the description proceeds, my invention'resides in .the combination and arrangement of parts hereinafter described and set forth in the claims.

the accompanying drawings wherein I have set forth a convenient embodiment of my invention,

'- Fig. 1 is a central transverse section through a 100m made according to my present invention,

Fig.2 is atop plan view taken in the direction of arr0w 2, Fig. 1, showing the cam lever and the weighted element associated therewith, I I

Fig.8 is an enlarged side elevation of the Warp stop motion proper shown in Fig. 1,

' Fig. 4 is an endview taken in the direction of arrow 4, Fig. 3, and l Fig. 5 is'a detail top plan view of certain parts taken in the Fig. 1.

Referring to Fig. 1, I have shown loom frame 10 having the usual bottomshaft 11.

which preferably makes a complete revolution every second pick of the loom. The shipper handle 12 is mounted on the shipper shaft 13 and when in the forward full line position shown in Fig. 1 is efi'ective to cause continued operation of the loom.

A supporting rod 14 located near the rear of the loom has mountedthereon the hub 15 of a head 16 in which are located a plurality of bushings 17 each provided with a depending link 18 secured thereto. Each bushing is operatively related to a non-circular detec tor rod 19 and all of saidrods arerequired to rock in unison by a connector 20 which joins the links operatively together.

The drop wires D are provided with slots 21 the upper ends of which are restricted as at 22. The drop wires are held raised by the warp but whenany warp thread breaks the corresponding drop wire will fall sothat the restricted portion 22 of the slot may surround the detector rod and by means of mechanism not shown but well'understood prevent rocking of said detector rod. The matter thus far described may be *substantially the same as the motions set forth in the aforesaid patents and forms present invention.

In carrying mypresent improvements into direction of arrow 5,

no part of my. a

effect I provide a bracket 30 secured to the loom frame and pivot thereto a lever'31'the rear end of which is provided with a roll 32 to have operative engagement with cam 33.

The latter has a'camvsurface 34 whichis effective during a certain period in the operation of the loom to depress the roll 32" and therefore elevate the forward end of the lever.

fin

of stopping due to'warp fault:

ment in a bracket 39 securedin the loom frame.

An actuator member or rod 40 has the lower end thereof threaded into the weighted element 37 and has the upper end thereof adapted for engagement with a shoulder 41 formed on the shipper handle. A collar 42 is adjustably secured in proper vertical position on the rod 40 and supports a control rod- 43 which extends rearwardly; The actuator rod extends loosely through'an elongated slot 44 formed in horizontal arm 45 of a'bracket 46 secured to the loomside. "Said slot extends backwardly andforwardly so as to, permit the rod 40 to move forwardly the dotted line 'positionshow'n in Fig. The slot 44 serves to hold the upper end of the rod 40 against improper movement away fromtheloomside and also help to direct'the actuator toward the shoulder 41 at the tlme The rear end ofthe rod 43 is plvotallylconnected as at 47 to the connector 20 so that movement of the rod 43to the ri ht as viewed 1 Y b in'lfigs. 1 and will cause a rocking of the detector rods 19 in a counter-clockwise clirection. 1 I s Inoperation, the cam 33 'willlact to give the forwardend o'f'the; lever 31-periodic11pward movements. These movements need not be abrupt but canbe gradual so that the weight'87 andthe rod 40.1nay' be caused to operate smoothly and efliciently. Under normal conditions when the'lever 31 is in the inoperative positionshown in Fig. 1 with the forward end down th'eweighted element 37 will rest on the screw 38 and serve to hold the actuator rod 40 in'the relatively rear position or to the left as viewed in Fig. 1 1n alignment withshoulder 41. As the forward end of lever 81 movesiupwardly toward operative position the weight 3-7 will tend to remain on its supporting screw'38 and thus change its angular relation with the lever.

'ij lf the drop wires are all raised so that the detector rods 19 are free to oscillate on their axes there will'be no resistance offered to the right hand movement-of the controller rod j 43 ,and upward movement of the lever 31 will therefore cause the actuator rod to move to the right or to the dotted line position shown in Fig. 1. When in this position it willbe clear thatthe actuator'rod is out of" alignment with the shoulder 41 so that continued upward movement of said actuator rod 7 will be ineffective to rock the shipper handle; 7

As the lever descends to its ino erative osition the rod 40 will be moved ackwar ly or to the left to assume its original position and this motion will be communicated fthrough rod 4am thelinks18 to move the detector rods 19 back to a position 'where a fallen drop wire ,can'move downwardly into restraining position with respect to the rod,

Should any one of the detector rods be held 7 its movement under these conditions it will] the shoulder 41 anchrock the shipper handle to thed otted line position shown 1n 1 to stop the loom.

From the foregoing it will be'seen that 1 V have provided a warp .stop motion wherein the detecting elements-are at the rear of theloom and the 'knockingeolf and actuating mechanism is located near the front of the loom and both sets of lllflClllIllSHlS are actuated through a single cam operating in con-;

junction with aweighted'element which may undergo a change in its normal'operation of moving the actuator rod,;ou t of alignment the loom when the control rod 43 is prevent ed frommoving forwardly by reason f a with the shoulder-41 and cause stopping of warp fault. 7

Having thus described my "invention it will be seen that changes and modifications a maybe made thereinby those skllled'i'n the r art without departing from the spiritand scope of the invention and 'I do not: wish to be limited to the detailsiherein disclosed, but what I claim'is:

1. Ina warp; stop motion, a non-circular detectorrod to be oscillated about itsaxis and located at therear of the loom,control mech-' anism movable from running to stopping po-r I sition and located atthe front of the loom, a A

regularly moving lever, a weighted; actuator member pivoted to the lever'beneath the conc trolmechanism and normally in alignment with the latter, and-a control rod operatively connected at'its rear end to the detector rod and at its forward end to theactuator memher, said weighted actuator memberbeing movable by the lever toward the stopping mechanism and tending to move out of alignment with the stoppingrmechanism and also 'tendlng to cause oscillation of the detector rod, inability of the detector rod to rock on itsaxis holding the-actuator memberinjalignmentwith the stopping mechanismto move, the latter from runn ng to stopping position as the lever moves upwardly.

2. In a loom, a shipper lever, a lrnocleofi 7 member for said lever,'a singleactuator supe'; porting said member to'glve the latter peri- V odic workmg movements toward thelshipper lever, a warp stop motion having. a; rodto be oscillated, connections. betweenythe rod and,

member, a yielding element controlled-by; the

actuator and acting throughthe connections to tend to oscillate the rod when the member has a working stroke, and tending to move the knock-01f member away from the shipper lever, the connections acting to direct the member toward the shipper lever when the rod is held against oscillation.

3. In a warp stop motion, a non-circular detector rod to be actuated about its axis, control mechainsm movable from running to stopping position, a weighted actuator member having a portionnormally in alignment with the control mechanism, a movable support for the actuating member to move the latter toward the stopping mechanism, a weighted element operatively connected to the actuator member, and a control rod operatively connected at its rear end to the detector rod in such a way as to cause oscillation of the detector rod when said control rod has a longitudinal movement, said control rod at its forward end being operatively connected to the actuator member, the weighted element when the support for the actuator member moves upwardly tending to oscillate the detector rod by a force communicated through the actuator member and control rod, said detector rod when held against oscillation holding the control rod against longitudinal movement to cause the actuator member to have engagement with the control mechanism to move the latter from running to stopping position.

In testimony whereof I have hereunto affixed my signature. WALTER H. WAKEFIELD: 

